Near-infrared line spectropolarimetry of hot massive stars

摘要: In order to study the inner parts of circumstellar materi al around optically faint, infrared bright objects, we present first medium-resolution spec tropolarimetric data taken in near-infrared. this paper discuss Paline GL 490, a well-known embedded massive young stellar object, and MWC 349A 342, twooptically faint stars that are proposed be pre-main sequence phase evolution. As check on method, classical Be starTau, known display line polarization changes at optical wavelengths, was observed as well. Three our targets show "line effect" across Pa�. ForTau effect is due depolarisation by electron-scattering disk. both cases, position angle polarisation i s consistent with larger scale disks imaged other validating infrar ed spectropolarimetry means detect flattening small scales. The tentative detectio n rotation Pain object 490 suggests presence rotating accretion disk an hole - similar those recently discovered wavelengths Herbig Ae T Tauri stars.